// $Id: ByteOps.java,v 1.4 2003/10/07 21:46:09 idgay Exp $

/*									tab:4
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 * All rights reserved.
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 * two paragraphs and the author appear in all copies of this software.
 * 
 * IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
 * OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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 * AND FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
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 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS."
 *
 * Copyright (c) 2002-2003 Intel Corporation
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE     
 * file. If you do not find these files, copies can be found by writing to
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300, Berkeley, CA, 
 * 94704.  Attention:  Intel License Inquiry.
 */
/**
 * ByteOps.java
 *
 * This class bring together all byte manipulation routines used elsewhere in the
 * program.
 *
 * @author Eugene Shvets
 */

package tools.util;

public final class ByteOps {

	/**
	 * Combines two bytes into an unsigned int
	 * 
	 * @param hibyte
	 *            is the most significant byte of the integer
	 * @param lowbyte
	 *            is the least significant byte
	 */
	public static int makeInt(byte lowbyte, byte hibyte) {
		return unsign(lowbyte) + (unsign(hibyte) << 8);
	}

	/**
	 * Combines four bytes into an unsigned long
	 */
	public static long makeLong(byte lsb, byte b2, byte b3, byte msb) {
		return unsign(lsb) + (unsign(b2) << 8) + (unsign(b3) << 16)
				+ (unsign(msb) << 24);

	}

	/* Given a byte, convert it to an unsigned int in the range 0 - 255 */
	public static int unsign(byte b) {
		if (b < 0)
			return (int) (b & 0x7f) + 128;
		else
			return (int) b;
	}
	/*
	 * public static int unsign(int b) { if (b < 0) return (int)((b & 0x7f)) +
	 * 128; else return (int)b; }
	 */
}
